vrayblendmtl and vraymtl2side

[xiao_tong]

I connect vraymtl2side to vrayblendmtl.The result is a green reflection,in cpu render.

[hermit.crab]

We need more information to determine what's going on. What result are you expecting? How's the material set up? Could you send a simplified scene?

[xiao_tong]

This is a file。in vrayblendmtl3_cloth have vraymtl2side1_xiuzi。This problem occurs when using the CPU render. File:https://drive.google.com/file/d/1LUY...ew?usp=sharing @hermit.crab

[hermit.crab]

Thanks for the provided scene. I managed to find two things:
1. ColorMath nodes are known to cause issues in both CPU and GPU (the green color in your scene is coming from "ColorMath4"). I'll speak with the project managers about it. For now, I recommend avoiding them and doing such operations in a post-processing software and afterward using the output file.
2. You're right. There seems to be a difference in how CPU and GPU handle a VRay Mtl 2Sided nested in a VRayBlend. I've logged the issue (internal bug-tracker id: VMAYA-11503) for dev investigation.